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Finding the Fourth Proportional to 1,018.79, 1,528.62 and 434.19

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Solution

The fourth proportional to 1,018.79, 1,528.62 and 434.19 is: 651.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,018.79 : 1,528.62 = 434.19 : x
  2. Step 2: Convert to fraction form
    1,018.79/1,528.62 = 434.19/x
  3. Step 3: Cross multiply
    1,018.79x = 1,528.62 × 434.19
  4. Step 4: Simplify right side
    1,018.79x = 663,711.52
  5. Step 5: Solve for x
    x = 663,711.52/1,018.79
  6. Step 6: Final answer
    x = 651.47

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.